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Updated: Aug 5, 2026

Imaging of Estrogen Receptor-α in Rat Pial Arterioles using a Digital Immunofluorescent Microscope
Published on: November 29, 2011
Acute effects of oestrogen receptor subtype-specific agonists on vascular contractility
Sandra Montgomery1, Linda Shaw, Nick Pantelides
1Smooth Muscle Physiology Group, Cardiovascular Research, Department of Medicine, Manchester Royal Infirmary, Oxford Road, Manchester M13 9WL.
Abstract:
This study shows for the first time that both the putatively selective oestrogen receptor alpha and oestrogen receptor beta agonists PPT (4,4',4"-(4-propyl-[(1)H]-pyrazole-1,3,5-triyl) tris-phenol) and DPN (2,3-bis(4-hydroxyphenyl)-propionitrile) can acutely relax precontracted isolated rat mesenteric arteries at pharmacological (i.e. micro M) concentrations. When compared to responses observed to similar concentrations of 17beta-oestrogen obtained on the same tissues, PPT had a significantly greater vasodilatory effect, while DPN had a significantly smaller effect. All responses were rapid being complete within 5 min exposure time. Thus, both PPT and DPN can acutely relax isolated mesenteric arteries with the relative potency of PPT>17beta-oestrogen>DPN.
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